<div nz-row>
  <div nz-col nzSpan="12">col-12</div>
  <div nz-col nzSpan="12">col-12</div>
</div>
<div nz-row>
  <div nz-col nzSpan="8">col-8</div>
  <div nz-col nzSpan="8">col-8</div>
  <div nz-col nzSpan="8">col-8</div>
</div>
<div nz-row>
  <div nz-col nzSpan="6">col-6</div>
  <div nz-col nzSpan="6">col-6</div>
  <div nz-col nzSpan="6">col-6</div>
  <div nz-col nzSpan="6">col-6</div>
</div>